Lifting-jack



D. R. ROBERTS.

I LI'TING JAGK. No.'286,488. Patented Oct. 9, 1883.

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UNITED STATES ,DIGIL R. ROBERTS, OF MADISON, OHIO.

LIFTING-JAC'K.

SEECIFJICATION forming part of Letters Patent No. 286,488, dated October9, 1883.

Application filed April 2, 1883. (Nomodehl i To all whom, t 17mg/concern.-

Be it known that I, D. R. ROBERT-s, of N ew Madison, county of Darke,and State of Ohio, have invented a new and useful Improvement inLifting-Jacks; and I do hereby declare that the following is a full,clear, and exact description of theinvention, which will enable othersskilled in the art to which it appertains to make and use it, referencebeing had to the aecompanying drawing, forming a part thereof.

My invention relates to lifting-jacks; and it consists in the partswhich will be hereinafter described, and pointed out in the claims.

The accompanying drawing represents a perspective view of my device.

Aindicates the base-block, to which is secured the standards B B. C isan arm pivotally mounted at G between the standards. l) is a bolt andnut pivotally uniting arms E and C. F F are short slotted arms,pivotally united by bolt and nut G to the upper end of arm E. H is abevehbloclr, pivotally secured lat H to the outer ends of arms F. Theblock` H may be moved on the top E of block E. E2 is the top piece ofarm E, and it is formed integral therewith. l. is an arm fixed at I tothe projection E2. The lever J is pivoted at l2 to arm I, and fulerumedat J to standard B.

The dotted lines in the drawing representthe position of the shiftingblock H when placed on the step E of the arm E. By means of the slottedarms F and the nuts and bolts G the block H may be adjusted verticallyon the arm E, or said block may be secured in the position 'indicated indotted lines. The

object of the shifting block is to enable the operator to ad just thedevice so as to present a step of the desired height. The arms F and theslots therein may be made of any lengt-l1, whereby the scope of theadjustment may be increased. When the lever J is turned down below anangle of fortydive degrees, the arm E will be drawn in toward thestandards, and the arm placed over the fulcrum J and the parts therebylocked-that is to say,while the parts are in that position the. steps orblock are adapted to receive the usual weight and support the samewithout. forcing up the lever.

Having thus described myinvention, I claim as new and desire to secureby Letters Patentl. Aliftingjack consisting of the standards B, securedvertically to the block A, the arm C, pivoted between the lower portionof the standards. and lever J, pivot-ed ,between the upper ends of saidstandards, and the arm E, having its lower end pivoted to the arm C, itsupper end to the lever J by means of the strap I, said arm E beingformed wit-ha suitable plane surface, E', for the axle to rest upon,substantially as shown and described.

2. A lifting-jack consisting of the standards B, arm C, lever J and armE, arranged as shown, the said arm Ebeing'provided with a shiftingblock, H, secured to the upper portion of the arms by means of theslotted straps F, as shown.

In testimony that claim the foregoing I append my signature.

DICK. IR. ROBERTS.

Witnesses:

J. W. BnoDnicK, LEM MURRAY.

